UV CURING MULTI-LAYERED POLYMER ELECTROLYTE AND LITHIUM SECONDARY BATTERY CONTAINING THE ELECTROLYTE

摘要

PURPOSE: A UV curing multi-layered polymer electrolyte and a lithium secondary battery containing the electrolyte are provided, to improve the adhesive strength, the mechanical properties, the low and high temperature characteristics, the high rate discharge capacity, the lifetime, the capacity and the stability of a battery. CONSTITUTION: The electrolyte comprises a separation membrane layer, a UV curing polymer layer and an organic electrolyte solution which is prepared by dissolving a lithium salt into an organic solvent. The separation membrane layer is made of a polymer electrolyte, polypropylene, polyethylene polyvinylidene fluoride or non-woven; the UV curing polymer layer comprises the polymer obtained by UV curing the ethylene glycol di(meth)acrylate oligomer represented by the formula CH2=CR1COO(CH2CH2O)nCOCR2=CH2(wherein R1 and R2 are independent each other and are H or methyl group and n is an integer of 3-20), and the polymer selected from the group consisting of a polyvinylidene fluoride-based polymer, a polyacrylonitrile-based polymer, a poly(methyl methacrylate)-based polymer, a poly(vinyl chloride)-based polymer and their mixtures. Preferably the lithium salt is selected from the group consisting of LiPF6, LiClO4, LiAsF6, LiBF4, LiCF3SO3, Li(CF3SO2)2N and their mixtures; and the organic solvent is selected from the group consisting of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, ethylmethyl carbonate and their mixtures.